Delta Electronics VFD-L Series Spezifikationen PDF herunterladen (Seite 93)

VFD-M Series

7-1

CHAPTER 7 TROUBLESHOOTING AND FAULT INFORMATION

The AC drive has a comprehensive fault diagnostic system that includes several different

alarms and fault messages. Once a fault is detected, the corresponding protective functions

will be activated. The following faults are displayed as shown on the AC drive digital keypad

display. The three most recent faults can be read on the digital keypad display by viewing

Pr.73 to Pr.75

NOTE: faults can be cleared by resetting at the keypad or with Input Terminal.

Common Problems and Solutions:

Fault

Name

Fault Descriptions

Corrective Actions

The AC drive detects an

abnormal increase in current.

1. Check whether the motors horsepower

corresponds to the AC drive output power.

2. Check the wiring connections between the

AC drive and motor for possible short

circuits.

3. Increase the Acceleration time (Pr.10,

Pr.12).

4. Check for possible excessive loading

conditions at the motor.

5. If there are any abnormal conditions when

operating the AC drive after short-circuit

being removed, it should be sent back to

manufacturer.

The AC drive detects that the

DC bus voltage has exceeded

its maximum allowable value.

1. Check whether the input voltage falls within

the rated AC drive input voltage.

2. Check for possible voltage transients.

3. Bus over-voltage may also be caused by

motor regeneration. Either increase the

decel time or add an optional braking

resistor.

4. Check whether the required braking power is

within the specified limits.

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Delta Electronics VFD-L Series Spezifikationen Seite 93